APC AP04742 Propeller 4.7x4.2E for Speed 400 Motor Applications  [AP04742]

4.7x4.2E Prop Shaped for Use with Speed 400 Motors

The APC AP04742 propeller adopts the 4.7x4.2E sizing and is matched to Speed 400 motor applications typical of small electric models. It offers a direct-replacement form factor that prioritises reliable fitment and basic tuning options over advanced aerodynamic claims.

Fitting is straightforward: check the prop seats correctly on your Speed 400 shaft or adapter, secure it with the right retainer, and confirm the orientation matches motor rotation. Perform a controlled static check at low throttle following installation to validate secure attachment before flying.

For care and tuning, inspect the blades and hub for any signs of damage and replace if necessary. A simple balance procedure using a small balancer or centre-point check will reduce vibration and make the model's throttle response more consistent.